On 3.1.2012, at 17.12, Timo Sirainen wrote: > On 3.1.2012, at 16.54, Mikko Lampikoski wrote: > >> I got Dual Core Intel Xeon CPU 3.00GHz, over 1000 mailbox and almost 1 >> dovecot login / second (peak time). >> Server stats says that load is continually over 2 and cpu usage is 60%. top >> says that imap is making this load. > > You mean an actual "imap" process? Or more than one imap processes? Or > something else, e.g. "imap-login" process? If there's one long running IMAP > process eating CPU, it might have simply gone to an infinite loop, and > upgrading could help.
It is "imap" process and process takes cpu like 10-30 seconds and then PID changes to another imap process (process also takes 10% of memory = 150MB). Restarting dovecot does not help. >> virtual users are in mysql database and mysqld is running on another server >> (this server is ok). >> Do I need better CPU or is there something going on that I do not understand? > > Your CPU usage should probably be closer to 0%. I think so too, but I ran out of good ideas. If someone have lots of mails in mailbox can it make effect like this? >> login_process_size: 128 >> login_processes_count: 10 >> login_max_processes_count: 2048 > > Switching to http://wiki2.dovecot.org/LoginProcess#High-performance_mode may > be helpful. This loses much of the security benefits, no thanks. >> mail_nfs_storage: yes > > Do you have more than one Dovecot server? This setting doesn't anyway work > reliably. If you've only one server accessing mails, you can set this to "no". Trying this too, but I think its not going to help..
